Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Transmission Fluid Temperature (TFT) Sensor
The transmission fluid temperature (TFT) sensor is located on the internal wiring harness to the solenoid valves in the fluid pan.
It is a resistor and measures the transmission fluid temperature.
The transmission fluid temperature is used by the TCM for the following functions:
- Applying the torque converter clutch is not permitted until the transmission fluid reaches a certain temperature.
- Engagement of 4th gear is prevented in extreme sub-zero temperatures until the normal operating temperature is reached.
- If the transmission fluid temperature is excessive, a pre-set fixed shift curve is selected and the torque converter clutch is closed in 2, 3, 4 and 5; of the transmission warning indicator is activated. No substitute signal is available for the TFT sensor.
When the ignition is switched ON, the manual selector lever shift lock solenoid is actuated by depressing the brake (signal from the stoplamp switch). This retracts the locking pin so that the manual selector lever can be moved out of position P.
If the brake pedal should fail due to malfunction, manual unlocking is possible.
For this, the cover of the release mechanism must be removed and a suitable object (ignition key) pressed into the opening until the manual selector lever can be moved out of position P.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.